Storage Compound Accumulation in Diatoms as Response to Elevated CO 2 Concentration - Archive ouverte HAL Access content directly
Journal Articles Biology Year : 2019

Storage Compound Accumulation in Diatoms as Response to Elevated CO 2 Concentration

Abstract

Accumulation of reserve compounds (i.e., lipids and chrysolaminarin) in diatoms depends on the environmental conditions, and is often triggered by stress conditions, such as nutrient limitation. Manipulation of CO 2 supply can also be used to improve both lipids and carbohydrates accumulation. Given the high diversity among diatoms, we studied the two marine model diatoms-Thalassiosira pseudonana and Phaeodactylum tricornutum, a freshwater diatom, Asterionella formosa, and Navicula pelliculosa-found in fresh-and seawater environments. We measured the accumulation of reserve compounds and the activity of enzymes involved in carbon metabolism in these diatoms grown at high and atmospheric CO 2. We observed that biomass and lipid accumulation in cells grown at high CO 2 differ among the diatoms. Lipid accumulation increased only in P. tricornutum and N. pelliculosa grown in seawater in response to elevated CO 2. Moreover, accumulation of lipids was also accompanied by an increased activity of the enzymes tested. However, lipid accumulation and enzyme activity decreased in N. pelliculosa cultured in fresh water. Chrysolaminarin accumulation was also affected by CO 2 concentration; however, there was no clear relation with lipids accumulation. Our results are relevant to understand better the ecological role of the environment in the diatom adaptation to CO 2 and the mechanisms underpinning the production of storage compounds considering diatom diversity.
Fichier principal
Vignette du fichier
Jensen-2020-biology-09-00005.pdf (1.69 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive
Loading...

Dates and versions

hal-02431926 , version 1 (08-01-2020)

Identifiers

Cite

Erik L Jensen, Karen Yangüez, Frédéric Carrière, Brigitte Gontero. Storage Compound Accumulation in Diatoms as Response to Elevated CO 2 Concentration. Biology, 2019, ⟨10.3390/biology9010005⟩. ⟨hal-02431926⟩

Collections

CNRS UNIV-AMU
21 View
43 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More